الفهرس 
Introduction
Some biological aspects on the larval parasitoidOnly 14 pages are availabe for public view
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Abstract
The cabbage butterfly, P. rapae is one of the most important pests infesting curciferous plants, such as cabbage, cauliflower and canola causing serious damage in some regions.
The present work was conducted to add some information about this pest on some host plants, its natural enemies and their efficiency in limiting its population under field and laboratory conditions.
The obtained results could be summarized as follow :
1. The population fluctuations of the cabbage butterfly Pieris rapae L. reached the maximal abundance from the beginning to mid November for eggs, from the end of November to mid December for larvae and from mid December to early January for pupae in the both the two seasons of the study (2004/05 and 2005/06).
2. The highest monthly average numbers of immature stage populations were found on cabbage plants followed by cauliflower and the least were on canola plants for eggs, larvae and pupae during the two seasons of the study.
3. Date of planting had a significant effect on the number of immature stages of P. rapae, so the insect number were always higher in winter plantaion than that of summer concidering the all stages of the insect (eggs, larvae, pupae) in the two successive seasons of the study.
4. The larval duration of P. rapae was the shortest when the larvae reared on cabbage followed by cauliflower, turnip, radish and finally on canola.
5. The larval parasitoid, Sinophorus xanthotomus Grav. Was recorded for the first time in Egypt on the cabbage butterfly and it seemed to be very promising bioagent because its percentage of parasitism reached 44 and 48 % on cabbage, 40 and 44 % on cauliflower and 20 and 30 % on canola during the two seasons of this study.
6. The pupal parasitoid, Pteromalus puparum L. was also an effective against pupae. Its rate of parasitism was 20-25 % on cabbage and 25-30 % on cauliflower during the investigation period.
7. The biocides (Agreen and Neem extract) seemed to be an effective agents in controlling the larvae of cabbage butterfly, but more investigations are needed in this feild.